SN54AHC138, SN74AHC138

3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS

SCLS258I – DECEMBER 1995 – REVISED JANUARY 2000

4

POST OFFICE BOX 655303

recommended operating conditions (see Note 3)

SN54AHC138

SN74AHC138

UNIT

MIN

MAX

MIN

MAX

UNIT

VCC

Supply voltage

2

5.5

2

5.5

V

VCC = 2 V

1.5

1.5

VIH

High-level input voltage

VCC = 3 V

2.1

2.1

V

VCC = 5.5 V

3.85

3.85

VCC = 2 V

0.5

0.5

VIL

Low-level input voltage

VCC = 3 V

0.9

0.9

V

VCC = 5.5 V

1.65

1.65

VI

Input voltage

0

5.5

0

5.5

V

VO

Output voltage

0

VCC

0

VCC

V

VCC = 2 V

–50

–50

mA

IOH

High-level output current

VCC = 3.3 V ± 0.3 V

–4

–4

mA

VCC = 5 V ± 0.5 V

–8

–8

mA

VCC = 2 V

50

50

mA

IOL

Low-level output current

VCC = 3.3 V ± 0.3 V

4

4

mA

VCC = 5 V ± 0.5 V

8

8

mA

∆t/∆v

Input transition rise or fall rate

VCC = 3.3 V ± 0.3 V

100

100

ns/V

∆t/∆v

Input transition rise or fall rate

VCC = 5 V ± 0.5 V

20

20

ns/V

TA

Operating free-air temperature

–55

125

–40

85

°C

NOTE 3: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,

Implications of Slow or Floating CMOS Inputs, literature number SCBA004.

electrical characteristics over recommended operating free-air temperature range (unless

otherwise noted)

PARAMETER

TEST CONDITIONS

VCC

TA = 25°C

SN54AHC138

SN74AHC138

UNIT

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP

MAX

MIN

MAX

MIN

MAX

UNIT

2 V

1.9

2

1.9

1.9

IOH = –50 mA

3 V

2.9

3

2.9

2.9

VOH

4.5 V

4.4

4.5

4.4

4.4

V

OH

IOH = –4 mA

3 V

2.58

2.48

2.48

IOH = –8 mA

4.5 V

3.94

3.8

3.8

2 V

0.1

0.1

0.1

IOL = 50 mA

3 V

0.1

0.1

0.1

VOL

4.5 V

0.1

0.1

0.1

V

OL

IOL = 4 mA

3 V

0.36

0.5

0.44

IOL = 8 mA

4.5 V

0.36

0.5

0.44

II

VI = VCC or GND

0 V to 5.5 V

±0.1

±1*

±1

mA

ICC

VI = VCC or GND,

IO = 0

5.5 V

4

40

40

mA

Ci

VI = VCC or GND

5 V

2

10

10

pF

* On products compliant to MIL-PRF-38535, this parameter is not production tested at VCC = 0 V.